Department of Orthopaedics, the First Affiliated Hospital of Bengbu Medical Colloege, Anhui Diagnosis and Treatment Center of Osteoarthropathy, Anhui Key laboratory of Tissue Transplantation, Bengbu 233004, China
Abstract：Objective To discuss the measure of distance between the midpoint of acetabular notch line connecting and the centre point of acetabular by using acetabular center locator(ACL). To provide the anatomy basis for the man-made total hip replacement(THR) and to make sure the acetabular prosthesis is on the right place.Methods The specimens of pelvis (40 hips) from 20 normal adults were selected. The soft tissues of pelvis were peeled, and then get the labrum acetabulare, acetabular notch and Harris fossa. The center point of acetabulum was determined according to the intersection point of vertical diameter and horizontal diameter of acetabular bone. The distance between vertical diameter and horizontal diameter was recorded. The ACL was used to measure the distance between the midpoints of line connected with acetabular notehes to the acetabular center(MAC). The data were analyzed by using statistic analysis software.Results The vertical line and horizontal line were 45.50-55.60 mm, 44.50-52.54 mm. MAC was 26.60-33.82 mm, the average value of MAC was 30.87 mm. The acetabular center near the head round Harris fossa was closed to the acetabular articular surface. The scatter diagram was drawn according to the data of MAC with each of vertical line, horizontal line and the sum of vertical line and horizontal line. There was correlation between MAC and vertical diameter, horizontal diameter and the sum of vertical diameter and horizontal diameter. The Pearson coefficients (r) were 0.89, 0.81 and 0.91, respectively. The variables coefficient between MAC and the sum of vertical diameter and horizontal diameter were more close to 1 according to the pearson linear analysis, compare with MAC and vertical diameter, MAC and horizontal diameter. There were more significant linear positive correlation between MAC and the sum of vertical diameter and horizontal diameter.Coclusions The Pearson linear analysis suggest an obvious linear positive correlation between MAC and the sum of acetabular horizontal line and the vertical line, which means the value of the MAC can be obtained by measuring the distance between acetabular horizontal diameter and vertical diameter. Thus the acetabular center locator can be used in THA and revision to get positioning center of acetabular rapidly and accurately. This is a practical method for acetabular component orientation.
Kurtz SM, Ong KL, Schmier J, et al. Future clinical and economic impact of revision total hip and knee arthroplasty[J]. J Bone Joint Surg Am, 2007, 89(Suppl 3): 144-151.
[2]
Wan Z, Malik A, Jaramaz B, et al. Imaging and navigation measurement of acetabular component position in THA[J]. Clin Orthop Relat Res, 2009, 467(1): 32-42.
[3]
Beckmann J, Stengel D, Tingart M, et al. Navigated cup implantation in hip arthroplasty[J]. Acta Orthop, 2009, 80(5): 538-544.
[4]
Charity JA, Tsiridis E, Sheeraz A, et al. Treatment of Crowe Ⅳ high hip dysplasia with total hip replacement using the Exeter stem and shortening derotational subtrochanteric osteotomy[J]. J Bone Joint Surg, 2011, 93(1): 34-38.
[5]
Yalcin N, Kilicarslan K, Karatas F, et al. Cementless total hip arthroplasty with subtrochanteric transverse shortening osteotomy for severely dysplastic or dislocated hips[J]. Hip Int, 2010, 20(1): 87-93.
[6]
Saxler G, Marx A, Vandevelde D, et al. The accuracy of free-hand cup positioning-a CT based measurement of cup placement in 105 total hip arthroplasties[J]. Int Orthop, 2004, 28(4): 198-201.
[7]
Reikers O, Gunderson RB. Acetabular component anteversion in primary and revision total hip arthroplasty: an observational study[J]. Open Orthop J, 2013, 7: 600-604.
2014, Vol. 19 
